package com.cityfood.common.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

public class UrlUtils {
	
	/**
     * 向指定URL发送GET方法的请求
     *
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }
 
    /**
	 * 向指定 URL 发送POST方法的请求
	 *
	 * @param url 发送请求的 URL
	 * @return 所代表远程资源的响应结果
	 */
	public static String sendPost(String url, Map<String, ?> paramMap) {
	    PrintWriter out = null;
	    BufferedReader in = null;
	    String result = "";
	 
	    String param = "";
	    Iterator<String> it = paramMap.keySet().iterator();
	 
	    while (it.hasNext()) {
	        String key = it.next();
	        param += key + "=" + paramMap.get(key) + "&";
	    }
	 
	    try {
	        URL realUrl = new URL(url);
	        // 打开和URL之间的连接
	        URLConnection conn = realUrl.openConnection();
	        // 设置通用的请求属性
	        conn.setRequestProperty("accept", "*/*");
	        conn.setRequestProperty("connection", "Keep-Alive");
	        conn.setRequestProperty("Accept-Charset", "utf-8");
	        conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
	        // 发送POST请求必须设置如下两行
	        conn.setDoOutput(true);
	        conn.setDoInput(true);
	        // 获取URLConnection对象对应的输出流
	        out = new PrintWriter(conn.getOutputStream());
	        // 发送请求参数
	        out.print(param);
	        // flush输出流的缓冲
	        out.flush();
	        // 定义BufferedReader输入流来读取URL的响应
	        in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
	        String line;
	        while ((line = in.readLine()) != null) {
	            result += line;
	        }
	    } catch (Exception e) {
	    }
	    //使用finally块来关闭输出流、输入流
	    finally {
	        try {
	            if (out != null) {
	                out.close();
	            }
	            if (in != null) {
	                in.close();
	            }
	        } catch (IOException ex) {
	            ex.printStackTrace();
	        }
	    }
	    return result;
	}


}
